Transrotor Phono III

The Transrotor Phono III is a phono preamplifier that combines technical precision, uncompromising construction, and absolute versatility. Designed by the German manufacturer Transrotor, it is aimed at demanding audiophiles seeking a transparent and faithful link to enhance their turntables, whether equipped with moving magnet or moving coil cartridges.

Advanced Technical Architecture

The Phono III features a fully dual-mono architecture, where the left and right channels are processed completely separately. This approach, more costly to implement, ensures optimal channel separation and eliminates the risk of crosstalk between stereo channels.

The external power supply is another cornerstone of this design. By relocating the power section to a separate enclosure, Transrotor eliminates electromagnetic interference that could pollute the very low-level signals from phono cartridges. This power supply delivers perfectly filtered and stabilized current, which then undergoes a second level of filtering and stabilization directly within the preamplifier.

Versatility and Universal Compatibility

The Phono III’s MM/MC compatibility goes far beyond a simple switch. The device offers 16 levels of input impedance adjustment (100 to 1000 ohms for MC), 16 levels of input capacitance (47 to 850 pF for MM), and 16 levels of gain (38 to 64 dB). This granularity allows for perfect optimization to suit virtually any cartridge on the market.

These adjustments are made via switches directly integrated into the electronic board, requiring the enclosure to be opened. This approach, unusual in this price range, prioritizes signal purity by eliminating external connections and switches that could degrade transmission. Once the settings are made according to the cartridge used, they are not intended to be changed frequently.

Sound Quality and Character

The Phono III stands out for its precision and neutrality. Individually selected components and meticulous architecture achieve a remarkably low distortion rate and excellent signal-to-noise ratio. This technical approach results in detailed and dynamic reproduction, capable of revealing the subtleties of analog recordings.

However, this precision may sometimes be perceived as analytical by listeners accustomed to warmer sound signatures. The Phono III favors fidelity over coloration, making it an ideal choice for systems where preserving the natural character of recordings is desired, without adding a particular sonic signature.

Practical Use and Setup

Setting up the Phono III requires initial configuration according to the cartridge used. The supplied manual guides the user in choosing the appropriate settings, but this operation does require a minimum of technical knowledge. Once configured, the device operates completely transparently, without the need for further intervention.

The low power consumption (1.5 VA) allows the device to remain powered on at all times, contributing to thermal stability and thus consistent performance. This approach is recommended for systems used regularly.

Frequently Asked Questions

How do I make internal adjustments to the Phono III?
Adjustments are made by opening the enclosure and setting the micro-switches according to the tables provided in the manual. This operation, performed only once during installation, requires knowledge of your phono cartridge’s precise specifications.

Is the Phono III suitable for very low-output MC cartridges?
Yes, with its 16 gain levels up to 64 dB and impedance settings from 100 to 1000 ohms, it is perfectly suited to the most demanding MC cartridges, including those with very low output levels.

Can the Phono III be used with entry-level turntables?
While technically possible, the Phono III reveals its full potential with mid-range to high-end turntables. On more modest setups, its resolving power may highlight the limitations of the source.

Does the external power supply create installation constraints?
The external power supply, with its compact dimensions, can be easily placed near the preamplifier. The supplied connection cable is long enough for most setups, and distancing the power supply has a positive impact on sound quality.